But that's exactly what happens, AI isn't randomness, it's a set of predefined calculations. The randomness is in the seed/starting point. For e.g Stable Diffusion it is given/user input, resulting in perfect reproducibility.
None of this leads to an obviously clear cut legal position wrt copyright.
If we were all honest, we'd give up the idea of copyright altogether where ML is concerned. You can't get much closer to "It's just math, man" than what it is currently.
Of course, "it's just math, man" isn't precisely a legal argument, either.